Hi bwall,
Well, you said that "American made vehicles are produced EXACTLY to the standards prescribed to the workers by management". In reality, management doesn't prescribe standards at all, and neither do factory workers (regardless of what country "owns" the design). Standards are usually clearly defined requirements established at the start of a program before any engineering work is done. They can be safety requirements, legal requirements, engine emission requirements, or internal company 'base requirements' to name a few. These are usually the minimum things the vehicle has to meet by any manufacturer, US or other. The VW dieselgate scandal would be an example of not meeting a standard.
If you mean 'standard' as some level of customer acceptance or expectation, that also isn't delegated by management. For that, we have to pay a visit to the marketing division, the supplier quality reps, the engineering divisions, tier suppliers, the program MEs, the assembly MEs, the line workers, the dealers and branch managers, the training department and everyone in between. If you mean 'standard' as some form of reliability, that's something else entirely.
You then said "Vehicles are poorly designed and engineered because management accepts poor quality in order boost profits." This line of thinking works well with cheap consumer goods. If you buy a $15 coffee pot from Walmart, you have an expectation it won't burn down your house, or won't give you an electric shock, but if it fails after 2 years due to 'poor quality' you might not give it a second thought. You might even find a way to justify buying another one at the same price and dispose of it the same way when it dies. But I know of no global automaker that endorses this line of thinking. "Poor quality" never boosts profits; it leads to expensive recalls, logistical expenses, customer dissatisfaction, 'negative optics' and many other wastes, and manufacturers know that. Poor quality in the auto industry is almost always unintentional, but to elaborate on that, we have to define quality.
Your comment about upper management between Germany and the USA is interesting, because I technically work under the German arm of a US based company, yet both maintain design and manufacturing centers. Nothing impresses me more than the German assembly line workers. They are fast, help each other when one falls behind, have great attention to assembly detail and are well educated. Nobody wants to be the reason the assembly line stops.
However, industry wide there seem to be just as many 'finance men' at the top as there are 'engineering career men', regardless of the country of origin, and unless the person is incompetent for the job*, I can't conclusively agree that either delivers a perceived difference in results.
*If you want a shining example of incompetence and how to destroy a car company, check out Albert Lee's "Call Me Roger".